how to sleep better (1) 썸네일형 리스트형 Insomnia: How to Overcome Sleepless Nights and Improve Your Health Many people around the world experience insomnia, a common sleep disorder that affects both physical and mental health. Insomnia is defined as having trouble falling asleep, staying asleep, or waking up too early and not being able to return to sleep. In the United States alone, surveys show that more than 30% of adults report some level of sleep disturbance, and about 10% suffer from chronic in.. 이전 1 다음